Gale/patches/server/0109-Send-multiple-keep-alive-packets.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martijn Muijsers <martijnmuijsers@live.nl>
Date: Wed, 30 Nov 2022 00:43:42 +0100
Subject: [PATCH] Send multiple keep-alive packets

License: MIT (https://opensource.org/licenses/MIT)
Gale - https://galemc.org

This patch is based on the following patch:
"Alternative Keepalive Handling"
By: William Blake Galbreath <blake.galbreath@gmail.com>
As part of: Purpur (https://github.com/PurpurMC/Purpur)
Licensed under: MIT (https://opensource.org/licenses/MIT)

* Purpur copyright *

MIT License

Copyright (c) 2019-2022 PurpurMC

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of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 60e2b951216003ae1861b1ee218e38da107b1760..315c7737f75c426a7e5c091fb340187df12235de 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -7,6 +7,8 @@ import com.mojang.brigadier.StringReader;
 import com.mojang.logging.LogUtils;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap.Entry;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMaps;
+import it.unimi.dsi.fastutil.longs.LongArrayList;
+import it.unimi.dsi.fastutil.longs.LongList;
 import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
 import it.unimi.dsi.fastutil.objects.ObjectIterator;
 import java.time.Duration;
@@ -259,6 +261,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
     private long keepAliveTime = Util.getMillis();
     private boolean keepAlivePending;
     private long keepAliveChallenge;
+    private LongList keepAlives = new LongArrayList(); // Gale - Purpur - send multiple keep-alive packets
     // CraftBukkit start - multithreaded fields
     private final AtomicInteger chatSpamTickCount = new AtomicInteger();
     private final java.util.concurrent.atomic.AtomicInteger tabSpamLimiter = new java.util.concurrent.atomic.AtomicInteger(); // Paper - configurable tab spam limits
@@ -296,7 +299,10 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
     private final LastSeenMessagesValidator lastSeenMessages;
     private final MessageSignatureCache messageSignatureCache;
     private final FutureChain chatMessageChain;
-    private static final long KEEPALIVE_LIMIT = Long.getLong("paper.playerconnection.keepalive", 30) * 1000; // Paper - provide property to set keepalive limit
+    // Gale start - Purpur - send multiple keep-alive packets
+    private static final long KEEPALIVE_LIMIT_IN_SECONDS = Long.getLong("paper.playerconnection.keepalive", 30); // Paper - provide property to set keepalive limit
+    private static final long KEEPALIVE_LIMIT = KEEPALIVE_LIMIT_IN_SECONDS * 1000;
+    // Gale end - Purpur - send multiple keep-alive packets
     private static final int MAX_SIGN_LINE_LENGTH = Integer.getInteger("Paper.maxSignLength", 80); // Paper
 
     private String clientBrandName = null; // Paper - Brand name
@@ -395,6 +401,21 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
         long currentTime = Util.getMillis();
         long elapsedTime = currentTime - this.keepAliveTime;
 
+        // Gale start - Purpur - send multiple keep-alive packets
+        if (GaleGlobalConfiguration.get().misc.keepalive.sendMultiple) {
+            if (elapsedTime >= 1000L) { // 1 second
+                if (!this.processedDisconnect && this.keepAlives.size() >= KEEPALIVE_LIMIT_IN_SECONDS) {
+                    LOGGER.warn("{} was kicked due to keepalive timeout!", this.player.getName());
+                    disconnect(Component.translatable("disconnect.timeout"), org.bukkit.event.player.PlayerKickEvent.Cause.TIMEOUT);
+                } else {
+                    this.keepAliveTime = currentTime; // hijack this field for 1 second intervals
+                    this.keepAlives.add(currentTime); // currentTime is ID
+                    send(new ClientboundKeepAlivePacket(currentTime));
+                }
+            }
+        } else
+        // Gale end - Purpur - send multiple keep-alive packets
+
         if (this.keepAlivePending) {
             if (!this.processedDisconnect && elapsedTime >= KEEPALIVE_LIMIT) { // check keepalive limit, don't fire if already disconnected
                 ServerGamePacketListenerImpl.LOGGER.warn("{} was kicked due to keepalive timeout!", this.player.getScoreboardName()); // more info
@@ -3453,6 +3474,16 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
 
     @Override
     public void handleKeepAlive(ServerboundKeepAlivePacket packet) {
+        // Gale start - Purpur - send multiple keep-alive packets
+        if (GaleGlobalConfiguration.get().misc.keepalive.sendMultiple) {
+            long id = packet.getId();
+            if (!this.keepAlives.isEmpty() && this.keepAlives.contains(id)) {
+                int ping = (int) (Util.getMillis() - id);
+                this.player.latency = (this.player.latency * 3 + ping) / 4;
+                this.keepAlives.clear(); // We got a valid response, let's roll with it and forget the rest
+            }
+        } else
+        // Gale end - Purpur - send multiple keep-alive packets
         //PacketUtils.ensureRunningOnSameThread(packet, this, this.player.getLevel()); // CraftBukkit // Paper - This shouldn't be on the main thread
         if (this.keepAlivePending && packet.getId() == this.keepAliveChallenge) {
             int i = (int) (Util.getMillis() - this.keepAliveTime);
diff --git a/src/main/java/org/galemc/gale/configuration/GaleGlobalConfiguration.java b/src/main/java/org/galemc/gale/configuration/GaleGlobalConfiguration.java
index 2d8d042112db908d76da023329f16402791029aa..d87db127a13c37cd4d9e0ff2f0a5b5387c5fbb0b 100644
--- a/src/main/java/org/galemc/gale/configuration/GaleGlobalConfiguration.java
+++ b/src/main/java/org/galemc/gale/configuration/GaleGlobalConfiguration.java
@@ -77,6 +77,13 @@ public class GaleGlobalConfiguration extends ConfigurationPart {
 
         }
 
+        public Keepalive keepalive;
+        public class Keepalive extends ConfigurationPart {
+
+            public boolean sendMultiple = true; // Gale end - Purpur - send multiple keep-alive packets
+
+        }
+
     }
 
     public LogToConsole logToConsole;